2,2-dimethyl-3-oxopentanedinitrile

Conditions: temp:0.00; pressure:0.00; stir:

Conditions: temp:0.00; pressure:0.00; stir:

Conditions: temp:0.00; pressure:0.00; stir:

Conditions: temp:60.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a solution of 2,2-dimethyl-3-oxopentanedinitrile (500 mg, 3.7 mmol) prepared as described in Example 125A Step 1, in anhydrous EtOH (33 ml) was added phenylhydrazine hydrochloride (763 mg, 3.7 mmol) and the reaction mixture was heated at 60° C. for 2 h. The solvent was removed under reduced pressure and the residue taken in EtOAc, washed with water and brine and the organics combined, dried (MgSO4) and concentrated. The residue was purified by silica gel chromatography (hexane/ethyl acetate 1:1) to afford 2-(5-amino-1-phenyl-1H-pyrazol-3-yl)-2-methylpropanenitrile (451 mg, 54%) as a solid. 1H NMR (300 MHz, CDCl3) δ 1.76 (s, 6H), 3.84 (brs, 2H), 5.69 (s, 1H), 7.26-7.57 (m, 5H); LC-MS (ESI) m/z 227 (M+H)+. The solvent was removed under reduced pressure washed with water and brine dried (MgSO4) concentrated The residue was purified by silica gel chromatography (hexane/ethyl acetate 1:1)

Conditions: temp:60.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a solution of 2,2-dimethyl-3-oxopentanedinitrile (500 mg, 3.7 mmol) prepared as described in Example 125A Step 1, in anhydrous EtOH (33 ml) was added phenylhydrazine hydrochloride (763 mg, 3.7 mmol) and the reaction mixture was heated at 60° C. for 2 h. The solvent was removed under reduced pressure and the residue taken in EtOAc, washed with water and brine and the organics combined, dried (MgSO4) and concentrated. The residue was purified by silica gel chromatography (hexane/ethyl acetate 1:1) to afford 2-(5-amino-1-phenyl-1H-pyrazol-3-yl)-2-methylpropanenitrile (451 mg, 54%) as a solid. 1H NMR (300 MHz, CDCl3) δ 1.76 (s, 6H), 3.84 (brs, 2H), 5.69 (s, 1H), 7.26-7.57 (m, 5H); LC-MS (ESI) m/z 227 (M+H)+. The solvent was removed under reduced pressure washed with water and brine dried (MgSO4) concentrated The residue was purified by silica gel chromatography (hexane/ethyl acetate 1:1)

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: Prepared from 2,2-dimethyl-3-oxopentanedinitrile (500 mg, 3.68 mmol) and hydroxylamine sulfate (332 mg, 2.02 mmol) according to the method described for 3-isopropylisoxazol-5-amine in Example 122A Step 2. Purification via silica gel chromatography eluting with 5% to 60% ethyl acetate in hexanes, afforded 2-(5-aminoisoxazol-3-yl)-2-methylpropanenitrile as a colorless solid (130 mg, 23%). 1H NMR (300 MHz, CDCl3) δ 5.22 (s, 1H), 4.58 (brs, 2H), 1.72 (s, 6H); LC-MS (ESI) m/z 152 (M+H)+. Purification via silica gel chromatography eluting with 5% to 60% ethyl acetate in hexanes

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: Prepared from 2,2-dimethyl-3-oxopentanedinitrile (500 mg, 3.68 mmol) and hydroxylamine sulfate (332 mg, 2.02 mmol) according to the method described for 3-isopropylisoxazol-5-amine in Example 122A Step 2. Purification via silica gel chromatography eluting with 5% to 60% ethyl acetate in hexanes, afforded 2-(5-aminoisoxazol-3-yl)-2-methylpropanenitrile as a colorless solid (130 mg, 23%). 1H NMR (300 MHz, CDCl3) δ 5.22 (s, 1H), 4.58 (brs, 2H), 1.72 (s, 6H); LC-MS (ESI) m/z 152 (M+H)+. Purification via silica gel chromatography eluting with 5% to 60% ethyl acetate in hexanes

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: Prepared from ethyl 2-cyano-2-methylpropanoate (3 g, 21.25 mmol) according to the method described for 4-methyl-3-oxopentanenitrile in Example 122A Step 1, to afford 2,2-dimethyl-3-oxopentanedinitrile as a yellow oil (1.40 g, 48%) which was used in the next step without further purification. 1H NMR (300 MHz, CDCl3) δ 3.98 (s, 2H), 1.60 (s, 6H).

Conditions: temp:60.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a solution of 2,2-dimethyl-3-oxopentanedinitrile (500 mg, 3.7 mmol) prepared as described in Example 125A Step 1, in anhydrous EtOH (33 ml) was added phenylhydrazine hydrochloride (763 mg, 3.7 mmol) and the reaction mixture was heated at 60° C. for 2 h. The solvent was removed under reduced pressure and the residue taken in EtOAc, washed with water and brine and the organics combined, dried (MgSO4) and concentrated. The residue was purified by silica gel chromatography (hexane/ethyl acetate 1:1) to afford 2-(5-amino-1-phenyl-1H-pyrazol-3-yl)-2-methylpropanenitrile (451 mg, 54%) as a solid. 1H NMR (300 MHz, CDCl3) δ 1.76 (s, 6H), 3.84 (brs, 2H), 5.69 (s, 1H), 7.26-7.57 (m, 5H); LC-MS (ESI) m/z 227 (M+H)+. The solvent was removed under reduced pressure washed with water and brine dried (MgSO4) concentrated The residue was purified by silica gel chromatography (hexane/ethyl acetate 1:1)

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: Prepared from 2,2-dimethyl-3-oxopentanedinitrile (500 mg, 3.68 mmol) and hydroxylamine sulfate (332 mg, 2.02 mmol) according to the method described for 3-isopropylisoxazol-5-amine in Example 122A Step 2. Purification via silica gel chromatography eluting with 5% to 60% ethyl acetate in hexanes, afforded 2-(5-aminoisoxazol-3-yl)-2-methylpropanenitrile as a colorless solid (130 mg, 23%). 1H NMR (300 MHz, CDCl3) δ 5.22 (s, 1H), 4.58 (brs, 2H), 1.72 (s, 6H); LC-MS (ESI) m/z 152 (M+H)+. Purification via silica gel chromatography eluting with 5% to 60% ethyl acetate in hexanes

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: Prepared from ethyl 2-cyano-2-methylpropanoate (3 g, 21.25 mmol) according to the method described for 4-methyl-3-oxopentanenitrile in Example 122A Step 1, to afford 2,2-dimethyl-3-oxopentanedinitrile as a yellow oil (1.40 g, 48%) which was used in the next step without further purification. 1H NMR (300 MHz, CDCl3) δ 3.98 (s, 2H), 1.60 (s, 6H).

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: Prepared from ethyl 2-cyano-2-methylpropanoate (3 g, 21.25 mmol) according to the method described for 4-methyl-3-oxopentanenitrile in Example 122A Step 1, to afford 2,2-dimethyl-3-oxopentanedinitrile as a yellow oil (1.40 g, 48%) which was used in the next step without further purification. 1H NMR (300 MHz, CDCl3) δ 3.98 (s, 2H), 1.60 (s, 6H).